I was investigating my Command set and noticed a small knob on the shell of the snare. I found nothing in the instructions about it so I did a Google search and found out it was a snare sensitivity adjustment. I turn it and nothing happens. What is suppose to change when I turn it? I realize it changes the sensitivity but I don't understand how that works in the real world. It is the pressure of the sticks on the mesh or the crosstalk sensitivity?